From having interesting shell designs to being fascinating to observe, hermit crabs are brought home as unique pets while they also add variety to most aquariums and terrariums. Other salt and fresh water invertebrates, such as various types of snails, corals, Spiny and Purple Lobsters, Scarlet Skunk Cleaner shrimp, Decorator Crabs, and starfish also make great additions to your aquariums. Pet snails, such as the Tiger Sand Conch Snail and the Black Stripe Giant Nassarius Snail not only add beauty to your aquarium but they aerate the substrate and also help clean detritus from your aquarium. Along with pet snails, various types of starfish can be beneficial to your aquariums as they are peaceful to watch and also help prevent the build-up of algae. Meanwhile, other salt and fresh water invertebrates, such as various species of coral and anemones can add color and grace to your reef tanks as they also provide homes for other tiny organisms. Consider having a colony of hermit crabs as unique and low-maintenance pets or add various types of exotic invertebrates to enhance the charm of your aquarium.